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  • DS-PVX-Shutdown Valve-CE218-0711-rev2 www.chalwyn.com

    Models PVX-300, 301PVX-500, 501 PVX-800, 801

    (Pneumatically Actuated)Typical Applications

    PVX-300, PVX-500, PVX-800

    lFailsafe application to meet EU ATEX 94/9/EC defined hazardous areas

    lZone 1 and 2 applications to EN 1834 engine safety standards

    lUS offshore engines to Class 1 Div 2 and Div 1 safety standards

    lInternational offshore platform engine installations

    PVX-301, PVX 501, PVX 801

    lPetrochemical and LNG refineries

    lAll international areas where non-failsafe is permitted

    lUS offshore BOEMRE 2011 Safety Standards

    lZone 2 fire pump engine offshore applications

    lVehicles with air brakes

    lFuel tankers

    lEmergency vehicles

    lVacuum trucks

    Key benefits

    lSimple direct air pressure operation

    lBuild options to either open or close on the application of air pressure

    lAutomatic reset on loss of air pressure

    lValve status indicator

    lCombination of body sizes and hose adaptors to suit air intake diameters from 38 mm (1 1/2 inches) to 203 mm (8 inches)

    Diesel Engine Shutdown Valve

  • DS-PVX-Shutdown Valve-CE218-0711-rev2

    Diesel Engine Shutdown Valve - PVX

    page 2

  • DS-PVX-Shutdown Valve-CE218-0711-rev2

    Diesel Engine Shutdown Valve - PVX

    page 3

    Pneumatically operated diesel engine air intake closure valves based on the standard Chalwyn slimfit 3”, 5” and 8” bore butterfly valves with variants for both hazardous and non-hazardous areas.

    Available in basic flange mounted form or sup-plied fitted with hose adaptors or an integral




    C2 (min)

    C2 (max)

    Optional Hose Adaptor


    1/8” BSP Female Air Connection Port Vent

    Position indicator

    Valve Type


    Nominal Bore


    76 (3”)

    127 (5”)

    203 (8”)





    B mm










    flame trap housing (3” valves only).

    Body and disc manufactured in corrosion resistant hard anodised aluminium with PTFE coating. Suitable for salt air offshore environ-ments.

    Typical PVX Valve Arrangement

    Main Dimensions (mm)

    min & max *

    82.5 to 112.5

    102.0 to 157.5

    136.5 to 185.5

    * If accurate C2 measurement is required please contact Chalwyn.

  • DS-PVX-Shutdown Valve-CE218-0711-rev2

    Diesel Engine Shutdown Valve - PVX

    page 4

    76mm (3”) PVX-30* Bore Valves

    Adaptor To Suit Hose Bore Part Number mm (inches)

    HAX-320 38 (1 1/2)

    HAX-322 44 (1 3/4)

    HAX-301 51 (2)

    HAX-303 57 (2 1/4)

    HAX-304 60 (2 3/8)

    HAX-305 63.5 (2 1/2)

    HAX-306 67 (2 5/8)

    HAX-307 70 (2 3/4)

    HAX-309 76 (3)

    HAX-312 82 (31/4 )

    HAX-314 89 (3 1/2)

    HAX-319 102 (4)

    127mm (5”) PVX-50* Bore Valves

    Adaptor To Suit Hose Bore Part Number mm (inches)

    HAX-501 89 (3 1/2)

    HAX-503 95 (3 3/4)

    HAX-505 102 (4)

    HAX-507 108 (4 1/4)

    HAX-509 114 (4 1/2)

    HAX-511 121 (4 3/4)

    HAX-513 127 (5)

    HAX-518 140 (5 1/2)

    HAX-523 152 (6)

    Determine the size and position of the PVX valve to be installed. Within the various constraints imposed in the application the valve should be as gener-ously sized as possible. A pneumatic supply must be available to operate this valve type.

    PVX-300, PVX-500 and PVX-800 valves open on the application of air pressure. The ‘fail safe’ mode of operation of the PVX-300, PVX-500 and PVX-800 models makes them suitable for use in zone 1 haz-ardous areas.

    PVX-301, PVX-501 and PVX-801 close on the application of air pressure. This type of valve and

    203mm (8”) PVX-80* Bore Valves

    Adaptor To Suit Hose Bore Part Number mm (inches)

    HAX-807 178 (7)

    HAX-808 203 (8)


    Chalwyn control system is recommended for larger vehicles that have air brakes (see page 7).

    The actuators fitted to these valves are suitable for an operating temperature range between -20°C (-4°F) and 120°C (248°F) and a maximum applied pressure of 8 bar (120 psi).

    Ideally if hose adaptors or an integral intake flame trap housing is to be used, these should be identi-fied and ordered from Chalwyn at the same time as the basic PVX valve.

    Hose Adaptor Options

  • DS-PVX-Shutdown Valve-CE218-0711-rev2

    Diesel Engine Shutdown Valve - PVX

    page 5

    1. In the case of a naturally aspirated engine the Chalwyn PVX shut down valve should gener-ally be fitted as close to the engine air intake manifold as possible. If an air intake flame trap is also fitted, the PVX valve must be installed upstream (air cleaner side) of the flame trap.

    2. To avoid excessively high intake air tempera-tures at the PVX valve when fitted to a turbo-charged engine, it may be necessary to fit the PVX valve either upstream of the turbocharger or downstream of the intercooler (if fitted). Again, if an air intake flametrap is also fitted, the valve must be installed upstream of the flametrap.

    3. Where more than one PVX valve is fitted to an engine, as in the case of an engine with multiple intake pipes, a common pneumatic supply to the valves should be used to ensure that all valves close simultaneously. A balance pipe arrange-ment should also be incorporated to connect the separate intake pipes together downstream (engine side) of the shut down valves. Typically balance pipe diameters should be about 30% of the diameter of the intake pipes.

    4. The PVX valve may be installed at any conveni-ent angle.

    5. If hose adaptors are used, the mating hose should be of a reinforced or strong silicone type, provide adequate support for the valve and prevent excessive vibration. If necessary, addi-tional support brackets mounted from the engine should be considered.

    6. Particular care must be taken to ensure the integrity of the intake pipework between the Chalwyn valve and intake manifold. Ideally metal pipework should be used and any gaps kept as short as possible, (taking into account any rela-tive movement) and closed by reinforced hose. The possibility of a hose collapse on closure of the shut down valve must be avoided.

    7. Any engine crankcase breather connections into the intake system between the PVX valve and engine, or any internal crankcase breather arrangement venting directly into the engine intake ports must be sealed and replaced by an external breather system venting either to atmosphere or to the intake system upstream of the shut down valve. External breather system kits for various engine types are available from Chalwyn.

    8. Connect the intake port of the actuator to the air supply using suitable pipe and 1/8” BSP connec-tor (male, parallel).

    9. A fitting kit of several connectors with suitable BSP threads is available from Chalwyn as part SKA-100. This includes flexible hose.

    10. For further installation schematics and details of electric systems to operate PVX-301 or PVX-501 on vehicles, please see ‘System Selection Guide’ at www.dieselsafety.com/technical downloads. (Some detail of this is shown on page 7).

    NotesMaximum temperature of the engine intake air at the PVX valve not to exceed 150°C.

    Alternative types of air actuated valves are availa-ble from Chalwyn - see brochures CE231, CE236 and CE237.

    If automatic diesel fuel shut down is required in combination with air intake shut down a Chalwyn FSX-200 fuel shut down valve should also be specified (brochure CE226). Also order chosen PVX valve with ‘Y’ suffix and an FKX-300 fitting kit for easiest connections to the FSX-200.


  • DS-PVX-Shutdown Valve-CE218-0711-rev2

    Diesel Engine Shutdown Valve - PVX

    page 6

    PVX-300, PVX-500 and PVX-800

    Prior to engine start, air pressure must be applied to these failsafe PVX valves to open to the engine run position. (Note, the external yellow indicator on the valve shows the position of the valve disc). Air pressure must be maintained between 4 and 8 bar to hold the intake valve fully open whilst the engine runs.

    To carry out an emergency engine stop by closing the air intake valve, close down the air supply and vent the supply line. The valve will fully close once the air supply pressure at the valve falls below 2 bar.

    Exercise the valve by applying and venting the control air supply pressure. Check by observing the external position indicator that the valve is freely moving between the open and closed positions.

    For vehicle installations this can be done by holding the manual toggle electric switch as shown in the ‘System Selection Guide’ schematic on page 11.

    The PVX-301/501 will reset to open automatically when the switch is released.

    Check that the fasteners locating the PVX valve and any associated intake system or support bracket fasteners are securely tightened.

    Check that any flexible hoses in the engine intake system between the PVX valve and engine are free from damage and suitable for further service.

    Check that the air supply pipe to the PVX valve is properly supported, free from damage and the pipe fittings are tight.

    Run engine, preferably at low idle. Vent (or supply as appropriate) the control air pressure to the PVX valve and check that the engine stops within a few seconds. If not, check the engine air intake system for leaks. Should this not solve the problem remove the intake valve and return to Chalwyn for further investigation.

    Weekly: Monthly:


    PVX-301, PVX-501 and PVX-801

    With no air pressure applied to these PVX valves they will be naturally sprung fully open and the engine may be run.

    To carry out an emergency stop apply an air pres-sure of 4 to 8 bar to close the intake shut down valve.

    The supply pressure must be vented before attempting to re-start the engine. This venting will happen automatically and at a controlled slow speed when kit SKA-100 and 24 Volt Solenoid SVA-200 are installed and the outlet vent device is adjusted correctly. The PVX valve will then return to open position allowing the engine to run.


    NOTE: The pneumatic supply to the valve must be clean and dry.

  • DS-PVX-Shutdown Valve-CE218-0711-rev2

    Diesel Engine Shutdown Valve - PVX

    page 7

    Control System Information

    For further details of application of Chalwyn PVX*01 valves for vehicles requiring automatic shutdown of overspeed, please contact Chalwyn or your local distributor (www.dieselsafety.com/distributor).

    Chalwyn has a broad ar-ray of fully automatic shutoff systems and manual shutoff systems. Common operat-ing methods include electric, pneumatic, electric/pneumatic, mechanical, or combinations of these mechanisms. The Chalwyn System Selection

    Guide provides an overview of the most common types of systems used in applications today. The overview includes a description of the solution, a diagram of the components and includes the functional highlights of the components used in each solution. These

    overviews will provide the in-formation required to help you determine the best type of solution for your application.

    Download the brochure at www.dieselsafety.com/ technicaldownloads

  • by AMOT


    AMOT - USATel: +1 281 940 1800 Fax: +1 713 559 [email protected] Roda Deaco by AMOT - CanadaTel: +1 780 465 4429 Fax: +1 780 469 [email protected]

    Europe, Middle East and Africa

    AMOT - UKTel: +44 (0)1284 715739 Fax: +44 (0)1284 [email protected]

    AMOT - GermanyTel: +49 (0)40 8537 1298Fax: +49 (0)40 8537 [email protected]

    AMOT - RussiaTel: +7 495 617 12 96Fax: +7 495 913 97 [email protected]

    Asia Pacific

    AMOT - ChinaTel: +86 (0)21 6279 7700 Fax: +86 (0)21 5237 [email protected]

    AMOT SingaporeTel: +65 6408 6265 Fax: +65 6408 [email protected]





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